congruent

identical

Exactly the same

• equalIdentical in amount
• interchangeableAble to replace another
• tantamountEqual in significance

commensurate · indistinguishable · analogous · corresponding · equivalent · parity · counterpart · homologous · coequal · synonymous

fitting

Suitable or proper

• suitableProper for purpose
• properSocially appropriate
• aptNaturally suited or inclined

relevant · pertinent · germane · apropos · accordant · applicable · suited · befitting · meet · seemly

consistent

Not varying or contradicting

• coherentLogically connected throughout
• compatibleAble to work together
• harmoniousPleasingly in accord

consonant · accordant · concordant · synchronized · coordinated · unified · integrated · attuned · corresponding · matching

triangle

Three-sided plane figure

• polygonMultisided plane figure
• angleGeometric measure of rotation
• vertexPoint where edges converge

symmetry · parallel · perpendicular · bisect · transversal · adjacent · supplementary · theorem · proof · axiom

ratio

Comparative numerical relation

• scaleMeasure of relative size
• proportionalityScaling relationship between quantities
• correlationStatistical relationship measure

comparative · relative · corresponding · analogous · equivalence · commensurable · balanced · symmetric · reciprocal · fitting

• Samenessalike, similar, likeness, resemblance, matching
• in agreementaccord, harmony, unity, consensus, understanding
• compatibilitycompatible, incompatible, match, mismatch, fit
• shape propertiesconvex, concave, symmetric, regular, irregular
• geometryangles, circles, angle, shapes, lines
• math termsnumbers, plus or minus, linear growth, square, operand